FOUR-ZONE FLUIDIZED BED LIME KILN Russian patent published in 2002 - IPC

FIELD: fluidized bed kilns for endothermal calcination of limestone, applicable in metallurgical, chemical, building branches of industry. SUBSTANCE: fluidized bed kiln has two heating zones and a limestone calcination zone, line cooling zone and gas-distributing lattices in the base of the zones. Kiln zones specification complexes N_i=1...4 = (Smi

•Spi/S^o•Sopi)^0,25 make up: N₁=0.77-3.62; N₂=0.69-3.33; N₃=0.66-3.17; N₄=0.63-3.06, where i=1,2,3,4 is the index concerning the first (in direction of material flow) and second heating zones, calcination zone and cooling zone; Smi is mean surface area of material particle treated in the i-th zone; Spi is area of the i-th gas-distributing lattice; Si^° is port area of the i-th gas-distributing lattice; Sopi is total area of ports of the i-th gas-distributing lattice. The kiln zones are made in the form of separate modules interconnected by means of flange joints. The flange joints are made at the level of the gas-distributing lattices. EFFECT: enhanced operating characteristics featured by reduced consumption of fuel per process and yield of dustlike lime with enhanced yield of lump lime. 7 cl, 1 dwg, 2 tbl